This is a custom build, Running a 190cc piranha engine. After the break in period it started dying out. Removed the intake air box from the carb it ran fully, proving it was lack of air through the airbox, removed the air box completely, put a straight pipe intake, not exhaust, rode for 10 minutes, and it started to backfire like the carb was getting to much gas and not burning correctly causing a bog and exhaust backfire or possibly a bad ignition coil causing the backfire. I'll just try a new performance ignition coil and a slightly larger mukuni carb. Only two thing it's could possibly be after going to the drawing board.